Place radishes, water, plums, and ume vinegar in a sauce pan. Cover, bring to a boil and simmer 4 to 5 minutes minutes. While the radishes are cooking, blanche the greens in boiling water for 2 minutes. Remove, rinse, drain, squeeze out the water with your hands and chop. Remove umeboshi plums and discard. Remove radishes and place in a serving dish. Add kuzu to the cooking liquid, stirring constantly until thick and translucent. Pour sauce over radishes and arrange the cooked greens in the center.
Per serving - 38 calories, 0 g fat (7% calories from fat), 0 g protein, 1 g carbohydrate, 3 g fiber, 0 mg cholesterol, 468 mg sodium